Transcription of Watts, Vars and VA - Te Connectivity
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Watts, Vars and VA - Te Connectivity
Tyco Electronics Corporation Crompton Instruments 1610 Cobb International Parkway, Unit #4 Kennesaw, GA 30152 Tel. 770-425-8903 Fax. 770-423-7194 Watts, vars and VA The difference between VA and Watts. The purpose of this Tech Note is to clear up a common misunderstanding about the measurement of power in alternating current (AC) circuits. Most people with electrical experience have heard that power equals amps times volts. This is always true for direct current (DC) circuits, but the situation is more complicated with AC circuits. If an AC load is purely a resistive load, such as incandescent light bulbs and heaters without fans, then the power is indeed the product of volts and amps. However, in the world of alternating currents, there are three types of "power": Definitions 1.
Figure 1, Voltage to Current Phase Shift This phase shift between voltage and current reduces the overlap between the two curves and effectively delivers less power to the loads.
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